Underreamer



@ch 28 B924.

w. NEWBROUGH UNDERREAM'ER Filed May 24. 1923 2 sheets-sheet p 'V/l9\ fl a M. z,

INVENTOR WWEn/rau /z ATTONEYS.

WALT NEWIBROUGH, F WILMINGTON, CALIFORNIA, ASSIGNOR OI ONE-: is 1 r to GEORGE GHALKER, OF WILMINGTON, CALIFORNIA.

' unnnnnlnamnn.

Application filed hiay 24,

To all whom it may aomem:

Be it*known that I, WALT NE'WBROUGH, a citizen of the United States, and a resident of Wilmington, county of Los place below the vcasing. It is proposed to utilize for this purpose disk blades associated with the tool in such a'manner as to dis appear when the tool is passed through the casing andto project outwardly'when the tool is rotated after having reached. its

- destination. A tool "of thisycharacter is rendered particularly 'efiective when the blades are arranged at an angle to the axis of the casing so as to engage the wall under the casing in the same manner as a disk plow attacksthe soil... It is proposed in the J presentsinrention to provide an arrangement of this character in combination with means "of 'the'disks. The preferred form; of the invention is illustrated in the accompanying drawing in which; Figure 1 shows a side view of my underreamer, Figure 2 side view of the same taken at right angles to the view shown in 1 Figure 1, Figure 3 a detail view of a disk cutter as viewed from the inside, Figure 4 a side view of the same, Figure 5 a top plan nmranging of'the insertion and removal view ofa removable portion of the retain' ing member of my tool, Figure'6 aside view of said portion, Figure 7 'a section through the same taken along line V1l[Vll of Figure 6 Figure 8 a longitudinal section through the whole device taken along line VHT-VIII of Figure '2, Figure 9a detail view in side elevation of the retaining mem- 5 eer,- Fig'ure 10 a sectional view taken along line XX of Figure 1, and Figure 11 a bottom plan view of the retaining member shown in Figure ,9. Whilel have shown I only the preferred form of the invention 1 to have it understood that various 1923. Serial No. 541,181.,

changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit of the-invention. The blade retaining member (1) of. my

tool is preferably made barrel shaped so as to easily pass upwardly and downwardly through a casing disposed in the hole of a well previously drilled. A cylindrical per-. 4 tion (2) formed integral therewith entends upwardly and terminates in a threaded portion (3) adapted to be secured to a connecting member not shown in the drawing in any suitable manner. The reduced lower portion of theretaining member is also threaded as shown (4). The barrel shaped portion (1) is provided with two oblong re cesses 6) disposed in their generaldirection at an angle to the axis of the tool, the two 7 'recesseslying in intersecting planes.

Each recess is formed. to accommodate a disk cutter (5) such as shown in Figures 3' and 49116. has a knob (8) extending into the same with the knob pointing inwardly. The latteras far as' its interior face is concerned is spherical and adaptedto be received in a corresponding central recess (9) in the disk (11). The spherical enga ment allows of universal motion of the isk cutter relative to its support but this motion is limited interiorly by the dimensions 5 of the recess and exteriorly by the fact that a central embossment (12) projecting from the inner face of the disk'cutter strikes that portion of theiwall defining the recessthat lies opposite the knob (8). This particular portion ismade removable to allow of the insertion andremoval of the disk blade. It forms part of a central longitudinal slice (13) shown in detail in Figures 5, 6 and 7 and shown as being removed in Figure 9. This slice, which when in place conforms exactly to the outlines of the adjacent arts of the blade retaining member is norma ly held in place by means of a threaded sleeve (14) engaging the threaded lower portion (4 of the tool.

The disks (11) are preferably formed with webs (16) for reinforcing purposes and water may be admitted into the chambers or 3% recesses (6) in which the disks Work through the passage v(17) communicating with t e two recesses through t wo branches (18).,

" adapted 'to transmit rotary motion to the scription. The upper threaded end (3) of the tool is connected to a. rod or shaft same from any suitable source of power. If the tool is lowered through the casing the disk cutters whichpresent their backs on the outside of the tool are made to disappearin the barrel shaped retaining member due to the engagement with the wall of the casing. When a place below the casing has been reached the tool is rotated in the proper direction and the disk blades striking the wall ofthe hole Willbe swung outwardlyon their respective pivots and will begin to scrape the Wall so as to enlarge the hole. Particular attention is called to the fact that the slanting position of the blades within the recessescauses the same torevolve on their own axes whereby a slicing action is produced rather than a mere scraping action and whereby the effectiveness of the tool is increased considerably. The disks are limited in their outward motion by the emboss ment (12) previously referred to engaging with the wall of the recess. As the hole below the casing has been enlarged the tool may be pulled upwardly and whenthe disk blades strike the bottom edge of the casing they are forced inwardly so asto disap pear 'within the retaining member. It

should be understood that this latter operation is also assisted by the slanting position of the blades because the lower edge of the casing strikes the full rear face of the blades instead of striking its edge only as it would if the blades weresupported parallel to the axis of the tool.

If it is desired to remove the blades the sleeve (14:) is screwed 0E and the central slice (13) taken out whereupon the embossment (12) is free to swing about the pivot (8) until the disk is in a position that it may be removed.

I claim:

1. In an underreamer of the character described, a retaining member provided with a recess, a knob extending into the recess so as to point inwardly and a disc cutter having a recess in itsback engaging with the knob for universal motion;

2. In an underreamer of the character described, a retaining member provided with a recess, a knob extending into the recess so as topointinwardly and a disc cutter having a recess in its back engaging with the knob for universalmotion, the disc being formed to limit the motion of the disc cutter.

. In an underreamer of the character described, a retaining member provided with.

freedom of universal motiongyith the walls of the recess holding the cutting element in a slanting position.

4.. In an underreamer of the character described, a retaining member provided with a recess and an inwardly facing disc cutter mounted in said recess with limited freedom of universal motion.

5. In an underreamei of the character described, a retaining member provided with a slanting recess and an inwardly facing disc cutter mountedin said recesswith freedom of universal motion, with the walls of the recess holding the disc cutter in a slanting position.

WALT NEVVBRUUGH. 

